Electric-fuse case.



T. E; MRAY.

ELEOTBIO FUSE OASE.

APPLIDATIOH FILED SEPT. 28, 1908.

Patented Apr. 2.7, 1909.

Fig. E

4 ably made. of porcelain.

4UNITED sra'ras THOMAS E. MURRAY, OF NEW YRK, N. Y.

ELECTRIC-FUSE CASE.

Specification oi.' LettersiPatent.

Patented April 27, 1909.

Application filed September 28, 1908. Serial No. 455,082.

To all whom it may concern:

Be 1t known that I, Tnonas E. MURRAY,

.a citizen of the United States. residing at New York, in the county of New York and htate of New York, have invented a certain new and useful Improvement in Electric- Fusc Cases, ot' which the following is a specification.

The invention relates to electric fuse cases or plugs. andto the construction whereby the fuse chamber in said plug is seat-ed.

lhe invention' consists in the combination with a tubular t'use case and fuse therein, of a disk-shaped cover constructed to enter the bore ot' said case. and means for locking said cover in place in Said bore all as particularly pointed out in the claims.

ln the accompanying drawings- Figure 1 is a top view of my fuse case. Fig. 2 is a longitudinal section. Fig. 3 is a side elevation. Fig. fl is a plan and Fig. 5 an edge view of the locking cover.

Similar letters of reference indicate like parts.

The case is tubularin form and preferlt includes inte grally a threaded cylindrical portion A and a flanged portion l. The boro in portion B is enlarged and preferably outwardly flared, as shown at (I. ln vardly protruding from the walls of the flared bort` C are diametrically opposite projections l), D. Below the projections is a cylindrical-space E, the diameter of which is tgreater than the diameter of the. fuse receiving chamber F, so that a shoulder G is produced at one end of said vf chamber. the other end of said chamber be- Ametal contact. sleeve M, which incloses the threaded -portion A. The fuse is arched or turned downwardly just below the shoulder (l, and its receiving chamber F is filled with powdered mag-nesta, talc, or other incombust-ible material. i l

vln order t'o seal the fuse case and prevent access to the fuse, l provide a disk-shaped cover N, also preferably of porcelain, having two recesses O in itsclrcumferential edge, of suticient size to receive the projections D, D. On the upper side of the cover is a recess l".

lVhen the cover L inserted in the enlarged portion C of the bore, the recesses O pass over the projections D, so as to allow said cover to become seated on the shoulder (lr in the space E, between said projections l and said shoulder. 'lhe cover is thenro- 65 tated by insertion otl a screw driver or other convenient tool in the recess l, so as to bring its solid portion under the projections D. whereby it becomes securely locked in place. thus sealingl and preventing' access to the 7o t'use chamber F. l

In another application t'or Letters Patent. Serial No. 426.641, tiled April 13, l908,-l have shown and described and claimed cylindrical threaded fuse plugs having at their upper portions recesses or indentations to receive a locking bar, whereby said fuse plugs are prevented trom rotation and con- `sequent removal from then' seat/s. The openings shown in the upper flanged portion B of my present device are intended to receive a.lock`ing bar in substantially the same way as disclosed in my aforesaid application, so that said locking'bar then comes above a disk N.

l claim:

1.'l`he combination of a tubular case closed at one end, a fuse in said case, pulverized noncombustible material in said case and embedding said fuse, a disk of hard noncombnstible material constructed to enter 'and close the bore of said case and-bearing upon said pulverized material, vandmeans within said bore for lockingv said disk therein. l f

2. The combination of' a tubular case of ictile material closed at one end, a fuse/in. said case.V pulverized noncombustible material in said case and-embedding saidfuse, a disk of tctile material constructed to enter '100 and close the bore of said case and bearing upon said pulverized material, inward projections in said bore, and recesses in the edge of said disk constructed to receive and pass over said projections.-

3. The. combination vof a4 tubular case closed at. 'one end and having apertures in its wallvnear its open end, a fuse in said case,

pulverized noncombustible material in said In testimony whereof I have aixed my case andl embedding said fuse, a disk of hard ,t signature in presence of two Witnesses.

noncombustible material' Within and closing f the bore of said case below said Wall aper'- lHOMAS E' MURRAY' 5 U," es and bearing upon said pulverized ma- Witnesses:

trlal, and means Within said bore for lock- GERTRUDE T. PORTER, ingsaid disk therein. l MAY T. MCGARRY. 

